uart_module.c

standdard test protocol

/****************************** Interrupt UART **************************/
#int_rda
void serial_isr( )
{
   RxBuff[Index] = getc( );
   Index++;
   if( Index == 1 )
   {
      if( RxBuff[0] != SYNC_MCU ) Index=0;
   }
   else if( RxBuff[3] == Index )
   {
      Index = 0;
      TimeOut = 0;
      RxFlag = TRUE;
   }
}
/************************************************************************/

/**************************** Interrupt Timeout *************************/
#int_timer0
void interupt_timer0_isr( )
{
   if( Index > 0 )
   {
      TimeOut++;
      if( TimeOut == TIME_OUT )
      {
         Index = 0;
         TimeOut = 0;
         //printf("Watch dog on.....");
         //printf("\n\rIndex = %u",Index);
      }
   }
}
/************************************************************************/

/****************************** Tx Function *****************************/
extern void uart_transmit( int Module, int Add_Sub, int PKG_Length )
{
   static BOOLEAN Flag=0;
   TxBuff[0] = SYNC_PC;
   TxBuff[1] = IPConfig;
   TxBuff[2] = Module;
   TxBuff[3] = PKG_Length;
   TxBuff[4] = Add_Sub;
   UartCrc = 0x00;
   for( k=0;k<(PKG_Length - 2);k++ )
   {
      TxBuff[5+k] = DatBuff[k];
   }
   for( k=0;k<(PKG_Length - 1);k++ ) UartCrc = TxBuff[k]^UartCrc;
   if( UartCrc == SYNC_PC )
   {
      UartCrc = ( UartCrc^0xFF ) + 1;
      TxBuff[PKG_Length-1] = UartCrc;
   }
   else TxBuff[PKG_Length-1] = UartCrc;

   Flag = 1;
   while(Flag)
   {
      for( k=0;k<PKG_Length;k++ )
      {
         putc( TxBuff[k] );
         delay_ms( 5 );
      }
      Flag = 0;
   }
}
/************************************************************************/

/*************************** CRC generate *******************************/
BOOLEAN crc_decode( void )
{
   static BOOLEAN flag;
   flag = FALSE;
   RxFlag = FALSE;
   UartCrc = 0x00;
   for( i=0;i<PKG_RX_CRC;i++ ) UartCrc = RxBuff[i]^UartCrc;
   if( UartCrc == RxBuff[PKG_RX_CRC] )flag = TRUE;
   else if( UartCrc != RxBuff[PKG_RX_CRC] )
   {
      UartCrc = ( UartCrc^0xFF )-1;
      if( UartCrc == SYNC_MCU ) flag = TRUE;
   }
   return( flag );
}
/************************************************************************/